How ​​to Filter Solana Protocol Subscriptions for Specific Programs and Instructions

Solana is a blockchain platform known for its fast and scalable transactions. One of the key features that allows developers to build complex applications is the ability to filter log subscriptions. In this article, we will explore how to filter Solana Protocol subscriptions for specific programs and instructions.

Why Filter Log Subscriptions?

Filtering log subscriptions allows you to see only relevant data from a specific program or instruction without being overwhelmed by unnecessary information. This can be especially useful when building complex applications on Solana.

For example, if you want to build a decentralized finance (DeFi) application that focuses on lending and borrowing, you may need to filter your log subscriptions for transactions related to the LendingPool program or the TokenizedLending instruction. This way, you can see only relevant data from these programs without being distracted by other protocols.

Setting Up Log Subscriptions

To set up a log subscription in Solana, you will need to create a solana-program-index file and add the desired program or instruction as a subroutine to that index. You can then use the solana-subscribe command-line tool to subscribe to specific log events.

Here is an example of how to set up a log subscription for the create instruction in the LendingPool program:

solana-program-index --key-file key.json --sub-routine index.json --program-index file://lendingpool.json --instructions [ "CREATE" ]

This command will subscribe to thecreateinstruction in theLendingPoolprogram and display only the logs for that specific instruction.

Using thesolana-subscribecommand-line tool

Thesolana-program-indexcommand-line tool provides a convenient way to set up log subscriptions. You can use it to create, update, or delete log subscription indexes with a single command.

Here is an example of how to use thesolana-program-indexcommand-line tool to subscribe to thecreateinstruction in theLendingPoolprogram:

solana-program-index --index file://lendingpool.json --subroutine index.json --program-index file://lendingpool.json --instructions [ "CREATE" ]

This will create a new log subscription index and subscribe to the createinstruction in theLendingPoolprogram.

• Make sure you have the correct account ID for the program or instruction you want to filter. You can use thesolana-program-index –account-file file://account.jsoncommand to generate the account ID.

• Use the–sub-routineoption to specify the index subroutine you are logging to. This will allow you to see only logs from that specific subroutine.

• Use the–instructionsoption to specify an array of instructions to filter by. You can use commas to combine multiple instructions.

• Use the–key-fileoption to specify a file containing your account IDs and instruction names. You can use this file to programmatically generate account IDs.

Solana log subscription filtering is a powerful feature that allows developers to build complex applications with minimal data noise. By following these guidelines and best practices, you can effectively set up log subscriptions for specific programs and instructions for your Solana project. With the command line toolsolana-program-index` and some basic knowledge of account IDs and instructions, you can easily create and manage log subscriptions in your Solana application.